User s Guide SX SKA ADVANCED COMMUNICATIONS & SENSING SX SKA. User s Guide: Advanced Mode. Revision 0.1 March Semtech Corp.

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1 : Advanced Mode 1

2 Table of Contents 1 Introduction Getting Started Kit Contents Installation SX1211SKA Overview Quick Start Guide SX1211SKA Quick Start (All Modes) SX1211SKA Receive Mode Configuration SX1211SKA Transmit Mode Configuration SX1211SXA Software Description Overview File Menu Shortcut Buttons Text Field Conventions for the SX1211SKA McParam Tab Overview Panel Register Hexadecimal Display The Mode Control Box The IrqParam Tab The RxParam Tab The TxParam Tab The OscParam Tab The Packet Test Tab Schematics and 2-Layer PCB Layout: SX1211SKA References

3 Table of Figures Figure 1. SX1211 Application Circuit...4 Figure 2. SX1211SKA Contents...5 Figure 3. SX1211SKA Board Picture...6 Figure 4. SX1211 User Interface, Default Settings...7 Figure 5. The New SX1211 Configuration: Ready to be Written...8 Figure 6. The SX1211SKA User Interface whilst in Packet Receiver Mode...9 Figure 7. The SX1211SKA User Interface Ready to Transmit the Demonstration Packet...10 Figure 8. SX1211SKA GUI Overview and References to the User Guide Description of this Chapter...11 Figure 9. Example Text Editor Output of the SX1211 Configuration File...12 Figure 10. SX1211 Local Oscillator Generation...15 Figure 11. The Overview Panel...15 Figure 12. The Hexadecimal Register Display Summary...16 Figure 13. The Mode Control Box also Incorporates RSSI...16 Figure 14. The Interrupt Mapping Display...17 Figure 15. SX1211 Receiver Block Diagram, the Colours Correspond to the Frequency of Operation...17 Figure 16. Receiver Parameter Display...18 Figure 17. SX1211 Simplified Transmitter Block Schematic Diagram...19 Figure 18. The Transmitter Parameter Tab Display...19 Figure 19. The Oscillator Parameter Display...20 Figure 20. The Packet Receiver / Transmitter Test Display...21 Figure 21. Software Display: Successful Packet Mode Reception

4 1 Introduction The SX1211 is a single chip transceiver IC designed for operation in the European 868 MHz and U.S. 915 MHz licence free ISM bands. The SX1211 is optimized for very low power consumption (3mA in receiver mode). It incorporates a baseband modem with data rates up to 200 kb/s. Data handling features include a sixty-four byte FIFO, packet handling, automatic CRC generation and data whitening. Its highly integrated architecture allows for minimum external component count whilst maintaining design flexibility. All major RF communication parameters are programmable and most of them may be dynamically set. The SX1211SKA is a USB evaluation tool designed to allow simple and easy evaluation of the suitability of the SX1211 for a given application. The low component count reference design implemented in the SX1211SKA is shown below: Figure 1. SX1211 Application Circuit The SX1211 main features include: Low Rx power consumption: 3mA Low Tx power consumption: dbm Good reception sensitivity: down to -107 dbm at 25 kb/s in FSK, -113 dbm at 2kb/s in OOK Programmable RF output power: up to dbm in 8 steps Packet handling feature with data whitening and automatic CRC generation Wide RSSI (Received Signal Strength Indicator) dynamic range, 70dB from Rx noise floor Bit rates up to 200 kb/s, NRZ coding On-chip frequency synthesizer FSK and OOK modulation Incoming sync word recognition Built-in Bit-Synchronizer for incoming data and clock synchronization and recovery 4

5 2 Getting Started 2.1 Kit Contents As illustrated in the figure below, the SX SKA Evaluation kit is composed of: A pair of SX1211SKA boards CDROM including all necessary PC software and documentation Figure 2. SX1211SKA Contents 2.2 Installation SX1211SKA Advanced Mode Software Installation 1- Put the CDROM in your computer and browse the contents of the CD. 2- Open the sx1211starterkitsetupweb.exe manually. It can be found in the \Installers sub directory of the CD-ROM. 3- Follow installation guidelines until the process is completed. Please note that.net Framework 2.0 and the FTDI USB driver will be automatically installed if not detected on your computer. 4- Connect the SX1211SKA board to the PC via the USB interface. 5- Launch SX1211SKA from the Start menu. 6- Click on Connect button in toolbar or in File menu. 7- SX1211SKA is now installed and ready to be used. 5

6 2.3 SX1211SKA Overview The SX1211SKA features the SX1211 reference design (1) and is also interfaced via an FTDI bridge (6) to the USB type A interface (5) of a host PC. Indication of transmission and reception is indicated on a pair of LEDs (4). A Johanson Technologies ceramic antenna is employed (2) and optional provision for an SMA connector (not populated) is provided for laboratory testing Figure 3. SX1211SKA Board Picture 6

7 3 Quick Start Guide With the SX1211SKA software installed, follow the sequence below to establish communication between the one SX1211SKA as transmitter and one SX1211SKA as receiver. 3.1 SX1211SKA Quick Start (All Modes) 1. Plug the SX1211SKA into the USB port of the computer. 2. Run the SX1211 User Interface software Start > All Programs > SX1211SKA > SX1211SKA 3. The SX1211SKA should connect automatically to the User Interface Software. If not, then click on the USB connect short-cut button, located in the top left hand corner of the window. 4. Once connected the SX1211SKA shows the default configuration of the SX1211 register settings upon power-up. Figure 4. SX1211 User Interface, Default Settings 5. Once connected the SX1211SKA shows the default configuration of the SX1211 register settings upon power-up (as shown in Figure 4). 7

8 6. The settings for communication between transceiver kits are located on the installation CD-ROM provided with the kit. Use the File > Open from the menu bar, or the open short-cut button to load a configuration file. 7. Load the XXX_SX1211_pingpong.cfg file from the SX1211 Demo Files folder on the CD-ROM. Where XXX corresponds to the frequency band of the SX1211SKA (either 868 or 915 MHz). 8. The display will then appear as shown in Figure 5. Figure 5. The New SX1211 Configuration: Ready to be Written 9. By clicking on the write button in the Registers config section, the new register values are written to the SX1211 registers. If successful, the red values in the hexadecimal register summary table will turn black. As a double check, the register read button may be pressed the values presented on the user interface should remain unchanged. 8

9 3.2 SX1211SKA Receive Mode Configuration 1. Click on the Packet tab to access the packet testing portion of the program. Within this window a predefined packet structure is already configured. It remains simply to click the Reception radio button and press the Start button. At this point the SX1211SKA enters packet receive mode and is now listening for valid packets. At this juncture another SX1211SKA must be configured as transmitter. Figure 6. The SX1211SKA User Interface whilst in Packet Receiver Mode 9

10 3.3 SX1211SKA Transmit Mode Configuration 1. Repeat steps 1 to 9 of Section 3.1 with the second SX1211SKA provided in the kit. Then click on the Packet tab. 2. The packet test display is preconfigured in transmit mode with a valid payload (see Figure 7). The Repeat value may be edited according to the number of packets desired to be transmitted (leave equal to zero for continuous transmission). 3. Press the Start button. Packets will start to be sent, the Tx Packets display indicating the number of packets sent. 4. The successful reception of packets will be indicated in the Rx packets window of the receiver SX1211SKA. Figure 7. The SX1211SKA User Interface Ready to Transmit the Demonstration Packet 10

11 4 SX1211SXA Software Description 4.1 Overview Figure 8 shows the SX1211SKA graphical user interface. Each of the numbers surrounding the display corresponds to the Chapter within this section which corresponds to the description of that GUI feature. Figure 8. SX1211SKA GUI Overview and References to the User Guide Description of this Chapter 4.2 File Menu File menu contains some general purpose functions. Some of them can also be accessed on the toolbar by clicking directly on the icon. The first feature in the list provides the possibility of connecting or disconnecting to the USB kit. Care must be taken to ensure that the USB port is closed before removing the USB kit. This functionality may also be accessed through the short cut buttons (see Section 4.3). The possibility of opening configuration files and saving the present configuration is also provided. This is done through a standard Windows file dialog box. The Help menu contains two menu items. The first item provides a link to this user guide in PDF format. The second, About SX1230 Starter kit, gives information in the revision of the software installed. 11

12 4.3 Shortcut Buttons The shortcut buttons provide identical functionality to those listed under the file menu The configuration file open shortcut button. This opens a windows file dialog box to allow access to previously saved SX1211 register configuration files. The save configuration file shortcut button immediately saves and overwrites the existing configuration file. The connect / disconnect button allows the user to manage manually connection and disconnection of the kit. Note that any time the SX1211SKA is to be removed from the system; the kit must first be disconnected. The saved configuration files are designed to be a useful tool for embedded software development. The file can be opened in any text editor to display the programmed register name, address and hexadecimal value programmed to that address. Figure 9. Example Text Editor Output of the SX1211 Configuration File 12

13 4.4 Text Field Conventions for the SX1211SKA An orange background highlight indicates that the precise value entered into the data entry field is not directly addressable by the SX1211. Instead the closest (rounded) value will be used. Conversely a red background highlight indicates where the maximum or minimum value for that register parameter has been exceeded. 4.5 McParam Tab Band Selection One of the three operating bands for the SX1211 may be selected here. The SX1211SKA hardware is band specific and so the corresponding band should be selected. VCO Voltage Trim In some designs the VCO voltage requires trimming. The SX1211SKA reference design does not require this function, but is included here for completeness. Modulation Selection The SX1211 is capable of both FSK and OOK modulation, they are selectable through the user interface by clicking with the mouse on the appropriate radio button. OOK Receiver Detection Type Several modes of OOK detection are possible, please see the SX1211 datasheet for mode information on configuring the OOK receiver. Data Mode Three data modes are available for the SX1211, typically packet mode is selected automatically, requiring no user selection, upon launching the Packet Test (see Section 4.13). Gain of the IF Stage The gain of the intermediate frequency amplifier chain can be adjusted manually. 13

14 Frequency Deviation Text entry field for the frequency deviation when using FSK modulation. Bit Rate The bit rate of the transmitted signal (in bps) can be directly edited in this data entry field. Floor Threshold for OOK Detection Margin to the OOK demodulation threshold see SX1211 datasheet for more details. FIFO Settings Both the working size of the FIFO and the number of bytes it must store before generating a hardware interrupt are user defined. Again this functionality is largely automated in the packet test mode (Section 4.13). PA Ramping The PA ramp rise time is selectable from the list of programmable values. Frequency of Operation The frequency of operation of the SX1211 is a set by three frequency divider ratios (see Figure 10). Based upon the frequency of the crystal oscillator and the values of these divider ratios the local oscillator frequency may be determined. To simplify this process, the SX1211SKA user interface sees this process completely automated. By entering the desired operating frequency in the text field at the top of the display, the resultant R, P and S divider ratios are calculated (see the SX1211 datasheet for information on their calculation). 14

15 Figure 10. SX1211 Local Oscillator Generation 4.6 Overview Panel A summary of the values presently entered into the user interface software is shown in the overview display at the bottom of the screen. This is sub-divided into three sections pertaining to: general configuration, transmitter settings and receiver parameters. Figure 11. The Overview Panel 4.7 Register Hexadecimal Display Figure 12 shows the register summary of the SX1211. In addition to manual user entry in the fields described in the previous section, direct hexadecimal entries may be made into the register display. Note that values yet to be written to the SX1211 registers appear in red. Note, also, that for full control flexibility, incorrect (red) values entered in the hexadecimal section will still be written in the event of a register write. So care must be exercised when editing the hexadecimal values. 15

16 Figure 12. The Hexadecimal Register Display Summary 4.8 The Mode Control Box The mode control box is sub-divided into three sections. The first Operating mode allows the user to change the operating mode of the SX1211 by clicking on the radio button corresponding to the desired mode. Note that the transition between modes is instantaneous. The centre section, Registers config allows the register settings entered elsewhere in the user interface to be written to the configuration registers of the SX1211 by clicking the write button. The read operation will read the configuration registers and refresh the user interface display with the values read from the SX1211. Figure 13. The Mode Control Box also Incorporates RSSI The third, rightmost, section of the mode control box allows an instantaneous RSSI (received signal strength indicator) measurement. Please note that this feature is only accessible when the SX1211 is in the receiver operating mode. 16

17 4.9 The IrqParam Tab Figure 14. The Interrupt Mapping Display For total register coverage by the user interface, the interrupt mapping for the SX1211 can be controlled through the configuration of the IrqParam display. Note, however, that the hardware interrupt feature is not used directly by the GUI. For further information please see the corresponding register descriptions in the SX1211 datasheet and the PCB layout and schematics of Section The RxParam Tab The receiver parameter field provides full access to all of the software configurable settings of the SX1211. For reference, a simplified block schematic of the SX1211 receiver is shown in figure Figure 15. The settings configurable in the receiver parameter tab correspond to the programmable baseband receiver functions. Figure 15. SX1211 Receiver Block Diagram, the Colours Correspond to the Frequency of Operation. 17

18 Figure 16. Receiver Parameter Display For a complete description of the functionality of the receiver section please consult the SX121 datasheet. However, the principle fields of interest for general use are: Rx Filters: The first three text entry fields of the receiver parameters correspond to the baseband filtering section. Note that the Butterworth filter is the narrowest of the three filters and determines the receiver channel bandwidth. Bit Synchroniser: This block performs timing recovery and synchronises the decision on whether a given bit is logical high or low based upon the received bit stream. This block yields a substantial improvement in receiver sensitivity performance and it is hence recommended that it be left enabled. Sync Word: The synchronisation word is applicable to operation in buffered and packet modes. For packet mode operation the sync word is set using the packet editor this may be found in the Packet Tab (Section 4.13). Link testing by the SX1211SKA is done in packet mode only sync word provision is made here for completeness. OOK Settings: OOK demodulation is based upon measurements from the RSSI block and there are a rich variety of settings for how the OOK signal is detected and processed. These techniques and the corresponding settings are given a detailed treatment in the SX1211 datasheet. 18

19 4.11 The TxParam Tab The transmitter configuration of the SX1211 is shown in Figure 17. This shows that the modulating signal is generated by direct digital synthesis (DDS), unconverted through the superheterodyne mixer stages and then amplified by a power amplifier chain. Figure 17. SX1211 Simplified Transmitter Block Schematic Diagram Figure 18. The Transmitter Parameter Tab Display The two parameters which are configurable for transmit operation of the SX121 are: Output Power: The output power of the SX1211 can be programmed in 3 db steps. Valid programmable powers are selected from a drop-down list of valid values. Interpolation Filter Setting: The DDS output requires filtering to remove the spurii common in the generation of signals through this technique; this is performed by the interpolation filters. The cut-off frequency of the interpolation filters can be selected from the drop down menu of valid values. The technique for calculating the cut-off frequency may be found in the SX1211 datasheet. 19

20 4.12 The OscParam Tab Figure 19. The Oscillator Parameter Display The oscillator parameter display gives access to the clock output functionality. This can be enabled or disabled and the frequency changed by entering a value in the CLK out frequency text field. Note also that there is provision to change the frequency of the crystal. Changing of the crystal frequency has a knock on effect on all parameters that are a function of the reference frequency, for example bit rate, filter settings, RF output frequency. The SX1211SKA is fitted with the 12.8 MHz crystal recommended in the SX1211 reference design. For this reason the crystal value should, typically, be left unchanged The Packet Test Tab The Packet tab is the principle interface for conducting transmission or reception testing. The display, as shown in Figure 18 is divided into three horizontal portions. The top portion of the display is given to the packet editor. Here the configuration of the packet, either to be transmitted or received by the SX1211SKA is constructed. The packet layout contains all of the features described in the SX1211 datasheet. This includes: Preamble This input allows the user enable and set the length of a pulse train preamble (sent at the data rate). Sync word size A custom syncronisation word of up to 4 bytes may also be added. Sync tol The number of errors which may be accommodated in the sync word (bits), before the packet is rejected. Format / Length / Address Fixed or variable length packets may also be stipulated (see the SX1211 datasheet for more information), as may an optional 1 byte address. Digital Coding Optional channel coding including CRC, data whitening and Manchester coding are also available. With these options entered the constructed packet is shown in the Packet frame. Where the SX1211SKA is to be used in transmit mode, the packet payload may also be edited in either ASCII or hexadecimal. Packet transmission is enabled by selecting the Transmission radio button. This starts when the Start button is pressed. Either infinite transmission (repeat value = 0) or a finite number of packets may be transmitted by editing the repeat value. 20

21 Figure 20. The Packet Receiver / Transmitter Test Display For receive mode, the normal mode of operation in conjunction with the SX1230SKA, the reception the Reception radio button is selected and the start button pressed. From this moment the SX1211 is placed in receive mode and listens continuously for a packet corresponding to the format entered in the packet editor. Upon successful reception, the payload received is shown in the Message Box and the number of received packets is incremented. For indication of the signal strength received by the SX1211SKA, the RSSI display (see Section 4.8) is activated and continuously refreshed. By way of example, Figure 21 shows the entire user interface display whilst receiving a valid packet payload. 21

22 Figure 21. Software Display: Successful Packet Mode Reception 22

23 5 Schematics and 2-Layer PCB Layout: SX1211SKA 23

24 24

25 6 References [1] SX1211 Datasheet 25

26 Semtech 2008 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Contact Information Semtech Corporation Advanced Communications and Sensing Products Division 200 Flynn Road, Camarillo, CA Phone: (805) Fax: (805)

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